<template>
  <div>
    <span v-for="(item, index) in arr" :key="index">
      <input
        type="checkbox"
        name=""
        id=""
        v-model="sum"
        :value="item"

      />{{ item }}
    </span>
    <p>你选中的元素累加和为：{{ total }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      sum: []

    }
  },

  computed: {
    total () {
      return this.sum.reduce((sum, item) => {
        return (sum += item)
      }, 0)
    }
  }
}
</script>

<style scoped lang="less"></style>
